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Simplifying 87 + -2x = 4x + -21 Reorder the terms: 87 + -2x = -21 + 4x Solving 87 + -2x = -21 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. 87 + -2x + -4x = -21 + 4x + -4x Combine like terms: -2x + -4x = -6x 87 + -6x = -21 + 4x + -4x Combine like terms: 4x + -4x = 0 87 + -6x = -21 + 0 87 + -6x = -21 Add '-87' to each side of the equation. 87 + -87 + -6x = -21 + -87 Combine like terms: 87 + -87 = 0 0 + -6x = -21 + -87 -6x = -21 + -87 Combine like terms: -21 + -87 = -108 -6x = -108 Divide each side by '-6'. x = 18 Simplifying x = 18
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